I know this thread is about daytime visibility... and I suspect this vest would work quite well in daylight... But I mention this as I just saw something like this, glowing, running up the street behind my house in the pre dawn morning. It was quite visible, and self lit. And quite obviously a runner.
I am not sure it was this exact vest... but it looked something like this.
https://www.safetysmartgear.com/glob...st-glo-315led/ There are likely similar designs for sale at other sites. This was just the first such image I found.
